TWI430014B - The construction to attach the optical filter to the diaphragm device - Google Patents

Description

Mounting structure of the filter relative to the aperture blade

The present invention relates to a filter mounting structure for mounting a filter on an aperture blade incorporated in an aperture device for an optical device such as a camera, a camera, or a monitor.

In the aperture device for performing light amount adjustment, the smaller the aperture diameter, the smaller the amount of movement of the diaphragm blades for adjusting the same amount of light. Therefore, it is necessary to control the movement of the diaphragm blades with higher precision and control the increase. Therefore, when the aperture diameter is reduced, a substantial aperture aperture is enlarged by inserting a filter (a dimming filter = ND (Neutral Density) filter) that restricts the amount of light passing through the aperture opening. Thereby, the control resolution when the aperture aperture is small is increased.

Specifically, the configuration is as follows: a small-sized ND filter is attached to the opening side of the diaphragm blade, and when the diaphragm blade is lowered to a predetermined aperture aperture, the ND filter is positioned within the aperture of the aperture to control the amount of passing light.

The ND filter is usually bonded to the diaphragm blade by an adhesive, and the filter use surface for attenuating the amount of light is attached to the opening from the edge of the opening of the diaphragm blade by a predetermined amount to mount the ND. Filter.

(a) and (b) and (a) and (b) of FIG. 6 are explanatory views of a method of attaching a conventional ND filter described in Patent Document 1.

In the method shown in FIG. 5, the bonding of the ND filter is performed using a bonding tool for bonding. As shown in Fig. 5 (a), the bonding tool 140 for bonding has a protruding portion at a central portion thereof for defining the edge of the opening portion 111 of the diaphragm blade 110 and the edge portion 121 of the ND filter 120. 141.

Fig. 5(b) shows a state in which the ND filter 120 is adhered to the aperture blade 110, and the bonding process is performed in the following order. First, the opening portion 111 of the aperture blade 110 is pressed by hand and fixed to the protruding section portion 141 of the clip tool 140, maintaining the state thereon, to overlap the protruding section portion 141 of the clip tool 140. The ND filter 120 is placed. On this basis, keep one hand No misalignment occurs between the aperture blade 110 and the ND filter 120, and the other hand applies the adhesive S to the range including the concave portion 125 for bonding of the ND filter 120 to be engaged with the aperture blade 110. .

However, in the above-described method in which the bonding tool 140 for bonding is used and pressed by hand, each of the aperture blade 110 and the ND filter 120 in a state of being overlapped may be clipped due to a shock or the like during the bonding. When the positioning position of the loading tool 140 is deviated, or the unevenness of the drying side of the adhesive S occurs, the deviation from the initial bonding position occurs, so that it is difficult to ensure correct positional accuracy.

Therefore, there has been proposed a solution in which four protrusions 216, 217 are provided on the front surface of the diaphragm blade 210 around the opening portion 211 as shown in Fig. 6(a), and are disposed in a rectangular shape as shown in Fig. 6(b). The four notches 226, 227 on the front edge portion and the rear edge portion of the ND filter 220 are respectively correspondingly embedded in the four protrusions 216, 217, thereby positioning the ND filter 220 relative to the aperture blade 210, and In this state, the aperture blade 210 and the ND filter 220 are joined by applying the adhesive S to the range of the concave portion 225 for bonding which includes the rear edge portion of the ND filter 220.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2001-356386

However, in the case of the mounting configuration of FIG. 6, since the ND filter 220 needs to be positioned in the front, rear, left, and right directions with respect to the aperture blade 210, the four notches 226, 227 are positioned to be engaged with each other to the four protrusions 216, 217, but due to the large number of locations, it is possible to spend time in the alignment. Further, since the number of the protrusions 216, 217 or the notches 226, 227 is large, the shape of the diaphragm blade 210 or the ND filter 220 is complicated, which may cause an increase in cost. Further, it is difficult to form the small projections 216, 217 themselves on the front surface of the diaphragm blade 210 made of an extremely thin material, and there are also problems that are difficult to achieve.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a mounting structure of a filter with respect to a diaphragm blade, which can accurately position a filter relative to a diaphragm blade by providing a minimum positioning mechanism, thereby realizing a filter. The simplification of the shape of the aperture blade and the ease of installation of the filter are easy to implement.

The invention of claim 1 provides a mounting structure of a filter with respect to a diaphragm blade, wherein a convex portion is formed on a front surface of the diaphragm blade made of a resin sheet for adjusting the amount of light, and a part of the diaphragm blade is mounted on the other hand. a gap is formed on the outer peripheral edge of the thin plate-shaped filter made of light, and the notch is engaged with the convex portion to position the filter with respect to the diaphragm blade, and in the state, the above The filter is adhered to the diaphragm blade, and the outer peripheral edge of the filter is set to the front side and the opposite side to the front side and the opposite side to be vertical. When the direction in the front-rear direction is the left-right direction, the filter is a planar shape having a substantially quadrangular shape having a front end edge, right and left side edges, and a rear end edge as outer peripheral edges thereof, and the left and right side edges of the filter. a pair of left and right U-shaped notches are formed thereon, and on the other hand, the convex portion is formed on the diaphragm blade, and the convex portion is engaged in the U-shaped notch of the filter, and the filter is Positioning in the rear direction and the left-right direction, the convex portion is formed into a substantially hemispherical convex portion by pressing a resin sheet as a material from the back surface side toward the front surface side, and the notch is engaged with the convex portion. The filter is positioned relative to the diaphragm blade, and in this state, the filter is adhered to the diaphragm blade by applying an adhesive to the rear end edge of the filter.

The invention according to claim 1 is the attachment structure of the filter according to the first aspect of the invention to the aperture blade, wherein the U-shaped notch of the filter is formed to be bilaterally symmetrical.

The invention of claim 3 is characterized in that the width of the U-shaped notch is slightly larger than the outer circumference of the approximately hemispherical convex portion and the above-described structure of the optical filter according to the first aspect of the invention. The diameter of the corner portion where the front surface of the aperture blade intersects is positioned by the abutting contact between the corner portion and the lower end of the inner surface of the notch, and the filter is positioned relative to the diaphragm blade.

The invention of claim 4 is the mounting structure of the filter according to any one of claims 1 to 3, wherein the U-shaped notch of the left and right side edges of the filter is the first notch. When the convex portion corresponding to the first notch is the first convex portion, a second U-shaped notch is formed on the rear end edge of the filter, and the optical coil blade is formed to be embedded therein. a second convex portion of the second U-shaped notch formed by pressing a resin sheet as a material from the back side toward the front side to form a substantially hemispherical convex portion by the first notch Engaging on the first convex portion, positioning the filter relative to the diaphragm blade, and simultaneously fitting the second U-shaped notch to the second convex portion. In this state, by including The U-shaped notch and the range of the second convex portion are coated with an adhesive to adhere the above-mentioned filter to the aperture blade.

According to the invention of claim 1, the filter can be correctly positioned in the front-rear direction and the left-right direction with respect to the diaphragm blade by providing a minimum number of positioning mechanisms (combination of the convex portion and the notch). Therefore, simplification of the shape of the filter or the diaphragm blade can be achieved, and the mounting work can be facilitated accordingly by reducing the abutting portion of the convex portion and the notch. Further, since the filter can be mounted without dislocating the filter, the size of the filter can be set to a minimum necessary, and the yield can be improved when a high-priced diaphragm material is used. In addition, since the filter is adhered to the aperture blade by applying an adhesive on the rear end edge of the filter, the optical system is not adversely affected by the leakage of the adhesive. Further, since the convex portion of the diaphragm blade is formed by pressing the resin sheet from the back side to the front side, the convex portion can be formed by a simple processing method, and it is easy to realize.

According to the invention of claim 2, since the U-shaped notch of the filter is formed to be bilaterally symmetrical, the filter can be positioned on the diaphragm blade without being affected by the relationship between the front and the back, and the fixing can be performed to achieve the mounting work. Sexual improvement.

According to the invention of claim 3, by correctly selecting the dimensional accuracy of the corner portion of the outer peripheral edge of the approximately hemispherical convex portion formed on the front surface of the diaphragm blade and the front surface of the diaphragm blade, the filter can be suspended. The tight state is firmly adhered to the front surface of the aperture blade.

According to the invention of claim 4, in the state in which the second U-shaped notch formed at the rear end edge of the filter is fitted to the second convex portion of the diaphragm blade, by including the second U-shaped notch and the The range of the two convex portions is coated with an adhesive to adhere the filter to the aperture blade, and thus is different from the case where the adhesive is only applied to the flat portion, and the adhesive is carried by the second convex portion or The U-shaped notch continuously forms a plurality of undulating portions, so that the adhesion between the filter and the diaphragm blades is more reliable.

(Best form of implementing the invention)

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a view showing a relationship between an aperture blade and an ND filter (filter), wherein (a) is a perspective view showing a state in which an ND filter is positioned in front of an aperture blade, and (b) is a view showing an ND filter. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1(b), and FIG. 3 is a perspective view showing the ND filter adhered to the aperture blade by an adhesive, FIG. 4 It is an exploded perspective view which shows the whole of the diaphragm apparatus which mounts this diaphragm blade.

As shown in FIG. 1, an opening portion 11 for adjusting the amount of light, a chute 12 for sliding, and a driving groove 13 for driving are provided through the diaphragm blade 10. Further, in the peripheral portion of the opening portion 11, three convex portions 15, 16, 16 which are bulged toward the front side are provided in the vicinity of the portion where the aperture diameter of the aperture is small. Here, for the three convex portions 15, 16, 16, the two convex portions 16 and 16 which are bilaterally symmetrical near the opening portion 11 side are referred to as a first convex portion, and the remaining one convex portion is referred to as a second convex portion 15 Distinguish. Further, the front-rear direction refers to a direction from the center of the ND filter 20 toward and away from the center of the opening portion 11, and the left-right direction refers to a direction perpendicular to the front-rear direction.

The aperture blade 10 is composed of a material which is subjected to fine surface extinction processing on the surface of an extremely thin (for example, 0.068 mm) light-shielding polyethylene film called a black conductive light-shielding film (trade name). In the sandblasting process, the smoothness is improved, and the three convex portions 15, 16, 16 are formed into a substantially hemispherical convex portion by pressing a resin sheet (membrane) as a material from the back side to the front side.

Further, the ND filter (filter) 20 for light reduction mounted on a predetermined portion of the diaphragm blade 10 is coated with a dimming property, for example, on the surface of an extremely thin polyethylene film having a thickness of about 0.15 mm. The material of the material is formed into a shape of a substantially quadrangular shape having a front end edge 21, right and left side edges 22, and a rear side edge 23 as outer peripheral edges thereof.

A pair of right and left U-shaped first notches 26 are formed symmetrically on the right and left side edges 22 of the ND filter 20, and a second U-shaped notch 25 is formed on the rear end edge 23 of the ND filter 20. The first notches 26 of the left and right side edges 22 are respectively fitted to the first convex portions 16 of the diaphragm blades 10, and the ND filters 20 can be opposed by the fitting between the left and right notches 26 and the convex portions 16. The aperture blades 10 are positioned in the front-rear direction and the left-right direction. In addition, the second notch 25 of the rear end edge 23 is fitted to the second convex portion 15 of the diaphragm blade 10, and the ND filter 20 can be used as an aid of the combination of the notch 26 and the convex portion 16 of the left and right side edges 22. Positioned relative to the aperture blade 10.

At this time, the relationship between the substantially hemispherical convex portions 15, 16 and the notches 25, 26 is set as the representative of the convex portion 15 and the notch 25 in Fig. 2, so that the widths 25H, 26H of the U-shaped notches 25, 26 are set. The diameters 15D and 16D of the corner portions which are slightly larger than the outer peripheral edge of the convex portions 15 and 16 and the front surface of the diaphragm blade 10 are used, and the filter is abutted against the lower end of the inner side surface of the notches 25 and 26, and the filter is used. 20 is positioned relative to the aperture blade 10. In other words, by correctly selecting the size of the corner portion of the convex portions 15, 16 which are raised on the front surface of the diaphragm blade 10, the ND filter 20 can be brought into close contact with the front surface of the diaphragm blade without being suspended. Positioning.

When the ND filter 20 is attached to the diaphragm blade 10, an adhesive is applied to the vicinity of the second convex portion 15 of the aperture blade 10 in advance, and the ND filter 20 is placed on the aperture blade 10 in this state. On, as shown in Figure 1 (b), will ND The first notch 26 of the filter 20 is fitted to the first convex portion 16 of the diaphragm blade 10 while the second notch 25 of the ND filter 20 is fitted to the second convex portion 15 of the diaphragm blade 10. Thereby, since the positioning of the ND filter 20 is ended, in this state, the adhesion from the upper surface of the ND filter 20 to the rear end edge including the second notch 25 and the second convex portion 15 is again applied. The agent S bonds the ND filter 20 to the front surface of the aperture blade 10. By the above steps, the aperture blade 10 with the ND filter 20 shown in Fig. 3 is formed.

Thereafter, as shown in FIG. 4, a set of the aperture blades 10B also equipped with the ND filter 20 are further combined and placed on the aperture substrate 40, and the chute 12 is fitted to the pin 42 on the aperture substrate 40. The two aperture blades 10, 10B are slidable. Further, at the same time, the rotation lever 53 of the drive unit 50 is engaged with each of the drive grooves 13 of the diaphragm blades 10 and 10B, and a cover (not shown) is placed on the diaphragm substrate 40, whereby the aperture device 60 can be completed.

As described above, according to the mounting structure of the ND filter of the present embodiment, the ND filter can be provided by providing a minimum number of positioning mechanisms (a combination of the left and right first convex portions 16 and the first notches 26). The relative aperture blades 10 are correctly positioned in the front-rear direction and the left-right direction. Therefore, simplification of the shape of the ND filter 20 and the diaphragm blade 10 can be achieved, and the mounting work can be facilitated accordingly by reducing the abutting portion of the convex portion 16 and the notch 26. Further, since the ND filter 20 can be mounted without being displaced, the size of the ND filter 20 can be set to a minimum necessary, and the yield can be improved when a high-priced diaphragm material is used.

In addition, the ND filter 20 is adhered to the aperture blade 10 by applying the adhesive S on the rear end edge 23 of the ND filter 20, so that the optical system is not brought by the leakage of the adhesive S. Bad influence. Further, since the convex portion 16 of the diaphragm blade 10 is formed by pressing the resin sheet from the back surface side toward the front surface side, the convex portion 16 can be formed by a simple processing method, which is easy to realize.

Further, since the first notch 26 of the ND filter 20 is formed to be bilaterally symmetrical, the ND filter 20 can be positioned on the diaphragm blade 10 without being affected by the relationship between the front and the back, and the bonding can be performed to achieve the mounting. Workable improve.

In addition, the ND filter 20 is positioned on the front, rear, left and right by the combination of the two sets of the first convex portion 16 and the first notch 26, so that the second convex portion 15 and the second notch 25 may not be provided from the viewpoint of positioning. However, by providing the second convex portion 15 and the second notch 25, the adhesion can be improved, especially for the peeling phenomenon.

That is, in a state where the second U-shaped notch 25 formed on the rear end edge 23 of the ND filter 20 is fitted to the second convex portion 15 of the diaphragm blade 10, by including the second U-shaped notch The range of 25 and the second convex portion 15 is coated with the adhesive S to adhere the ND filter 20 to the aperture blade 10, and thus is different from the case where the adhesive S is only applied to the flat portion, and the adhesive is applied. S is mounted on a plurality of undulating portions continuously formed by the second convex portion 15 or the U-shaped notch 25, thereby making the adhesion between the ND filter 20 and the diaphragm blade 10 more reliable.

10, 10B, 110, 210‧‧‧ aperture blades

11, 111, 211‧‧ ‧ openings

12‧‧‧Sliding trough

13‧‧‧ drive slot

15, 16‧‧ ‧ convex

15D, 16D‧‧‧ corner diameter

20‧‧‧ND filter (light reduction filter)

21‧‧‧ front edge

22‧‧‧ left and right sides

23‧‧‧The back edge

25‧‧‧ second gap

25H‧‧‧second gap width

26‧‧‧ first gap

26H‧‧‧ first gap width

40‧‧‧ aperture substrate

42‧‧ ‧ sales

50‧‧‧ drive unit

53‧‧‧Rotary lever

60‧‧‧ aperture device

120‧‧‧Filter

121‧‧‧Edge

125, 225‧‧ ‧ recess

140‧‧‧Clamping tools

141‧‧‧High section

216, 217‧‧ ‧ prominence

226, 227‧‧ ‧ gap

S‧‧‧Adhesive

1 is a view showing a relationship between an aperture blade and an ND filter (filter) according to an embodiment of the present invention, wherein (a) is a perspective view showing a state in which an ND filter is positioned in front of an aperture blade, and (b) A perspective view showing a state in which the ND filter is positioned behind the aperture blade.

Figure 2 is a cross-sectional view taken along line II-II of Figure 1 (b).

Figure 3 is a perspective view showing the bonding of an ND filter to a diaphragm blade with an adhesive.

Fig. 4 is an exploded perspective view showing the entire aperture unit in which the aperture blades are incorporated.

(a) and (b) of FIG. 5 are explanatory views of a method of mounting a conventional ND filter.

(a) and (b) of FIG. 6 are explanatory views of a mounting structure of a conventional ND filter.

10‧‧‧ aperture blades

11‧‧‧ openings

12‧‧‧Sliding trough

13‧‧‧ drive slot

15, 16‧‧ ‧ convex

15D, 16D‧‧‧ corner diameter

20‧‧‧ND filter (light reduction filter)

21‧‧‧ front edge

22‧‧‧ left and right sides

23‧‧‧The back edge

25‧‧‧ second gap

25H‧‧‧second gap width

26‧‧‧ first gap

26H‧‧‧ first gap width

S‧‧‧Adhesive

Claims (4)

A mounting structure of a filter with respect to a diaphragm blade is formed with a convex portion on a front surface of a diaphragm blade made of a resin sheet for adjusting a light amount, and a small sheet-like resin sheet attached to a part of the diaphragm blade. a notch is formed on the outer periphery of the dimming filter, and the notch is engaged with the convex portion, so that the filter is positioned relative to the aperture blade, and the filter is adhered to the aperture in the state. The blade is characterized in that when the side of the filter that protrudes toward the center side of the opening is set to the front, the opposite side is set to the rear, and the direction perpendicular to the front and rear is set to the left and right direction, The filter is formed into a substantially quadrangular planar shape having a front end edge, left and right side edges, and a rear end edge as outer peripheral edges thereof, and a pair of left and right U-shaped notches are formed on the left and right side edges of the filter, and the other In one aspect, the convex portion is formed on the aperture blade, and the convex portion is engaged in a U-shaped notch of the filter, so that the filter is positioned in a front-rear direction and a left-right direction, wherein the convex portion is Resin as a material The plate is punched from the back side toward the front side to form a substantially hemispherical convex portion, and the notch is engaged with the convex portion, whereby the filter is positioned relative to the diaphragm blade, and in this state, the filter is filtered. The trailing edge of the sheet is coated with an adhesive to bond the filter to the aperture blade. The mounting structure of the filter of the first aspect of the invention with respect to the diaphragm blade, wherein the U-shaped notch of the filter is formed to be bilaterally symmetrical. The mounting structure of the filter of claim 1 or 2 with respect to the aperture blade, wherein the width of the U-shaped notch is set to be slightly larger than the outer circumference of the approximately hemispherical convex portion intersecting the front surface of the aperture blade The diameter of the corner portion is such that the filter is positioned relative to the diaphragm blade by the abutment between the corner portion and the lower end of the inner side surface of the notch. The mounting structure of the filter according to claim 1 or 2 with respect to the diaphragm blade, wherein when the U-shaped notch of the left and right side edges of the filter is set as the first notch, When the convex portion corresponding to the first notches is a first convex portion, a second U-shaped notch is further formed on a rear end edge of the filter, and the aperture blade is provided with an insertable portion a second convex portion having a second U-shaped notch formed by pressing a resin sheet as a material from the back surface side toward the front surface side to form a substantially hemispherical convex portion, the first notch being engaged The first convex portion is configured to position the filter relative to the aperture blade, and at the same time, the second U-shaped notch is fitted on the second convex portion. In this state, the second U-shaped notch is included. And the range of the second protrusion is coated with an adhesive, thereby bonding the filter to the aperture blade.